 /*******************************************************************************
  * Copyright (c) 2004, 2007 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.ui.internal.presentations;

 import org.eclipse.jface.action.Action;
 import org.eclipse.jface.preference.IPreferenceStore;
 import org.eclipse.ui.internal.EditorPane;
 import org.eclipse.ui.internal.IPreferenceConstants;
 import org.eclipse.ui.internal.WorkbenchMessages;
 import org.eclipse.ui.internal.WorkbenchPartReference;
 import org.eclipse.ui.internal.WorkbenchPlugin;
 import org.eclipse.ui.internal.tweaklets.TabBehaviour;
 import org.eclipse.ui.internal.tweaklets.Tweaklets;

 public class SystemMenuPinEditor extends Action implements ISelfUpdatingAction {

     private EditorPane editorPane;

     public SystemMenuPinEditor(EditorPane pane) {
         setText(WorkbenchMessages.EditorPane_pinEditor);
         setPane(pane);
     }

     public void dispose() {
         editorPane = null;
     }

     public void setPane(EditorPane pane) {
         editorPane = pane;
         update();
     }

     public void run() {
         WorkbenchPartReference ref = (WorkbenchPartReference)editorPane.getPartReference();

         ref.setPinned(!isChecked());
     }

     public void update() {
         if (editorPane == null) {
             setEnabled(false);
             return;
         }

         WorkbenchPartReference ref = (WorkbenchPartReference)editorPane.getPartReference();
         setEnabled(true);
         setChecked(ref.isPinned());
     }

     public boolean shouldBeVisible() {
         if (editorPane == null) {
             return false;
         }

         IPreferenceStore store = WorkbenchPlugin.getDefault().getPreferenceStore();
         boolean reuseEditor = store
                 .getBoolean(IPreferenceConstants.REUSE_EDITORS_BOOLEAN)
                 | ((TabBehaviour)Tweaklets.get(TabBehaviour.KEY)).alwaysShowPinAction();
         return reuseEditor;
     }

 }

